// https://syzkaller.appspot.com/bug?id=7a185609aa78b2069b780ea42fae8d00029ea41c // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif static unsigned long long procid; static __thread int clone_ongoing; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) { exit(sig); } uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0; int valid = addr < prog_start || addr > prog_end; if (skip && valid) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ ({ \ int ok = 1; \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } else \ ok = 0; \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ ok; \ }) static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static void thread_start(void* (*fn)(void*), void* arg) { pthread_t th; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); int i = 0; for (; i < 100; i++) { if (pthread_create(&th, &attr, fn, arg) == 0) { pthread_attr_destroy(&attr); return; } if (errno == EAGAIN) { usleep(50); continue; } break; } exit(1); } typedef struct { int state; } event_t; static void event_init(event_t* ev) { ev->state = 0; } static void event_reset(event_t* ev) { ev->state = 0; } static void event_set(event_t* ev) { if (ev->state) exit(1); __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000); } static void event_wait(event_t* ev) { while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0); } static int event_isset(event_t* ev) { return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE); } static int event_timedwait(event_t* ev, uint64_t timeout) { uint64_t start = current_time_ms(); uint64_t now = start; for (;;) { uint64_t remain = timeout - (now - start); struct timespec ts; ts.tv_sec = remain / 1000; ts.tv_nsec = (remain % 1000) * 1000 * 1000; syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts); if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) return 1; now = current_time_ms(); if (now - start > timeout) return 0; } } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } //% This code is derived from puff.{c,h}, found in the zlib development. The //% original files come with the following copyright notice: //% Copyright (C) 2002-2013 Mark Adler, all rights reserved //% version 2.3, 21 Jan 2013 //% This software is provided 'as-is', without any express or implied //% warranty. In no event will the author be held liable for any damages //% arising from the use of this software. //% Permission is granted to anyone to use this software for any purpose, //% including commercial applications, and to alter it and redistribute it //% freely, subject to the following restrictions: //% 1. The origin of this software must not be misrepresented; you must not //% claim that you wrote the original software. If you use this software //% in a product, an acknowledgment in the product documentation would be //% appreciated but is not required. //% 2. Altered source versions must be plainly marked as such, and must not be //% misrepresented as being the original software. //% 3. This notice may not be removed or altered from any source distribution. //% Mark Adler madler@alumni.caltech.edu //% BEGIN CODE DERIVED FROM puff.{c,h} #define MAXBITS 15 #define MAXLCODES 286 #define MAXDCODES 30 #define MAXCODES (MAXLCODES + MAXDCODES) #define FIXLCODES 288 struct puff_state { unsigned char* out; unsigned long outlen; unsigned long outcnt; const unsigned char* in; unsigned long inlen; unsigned long incnt; int bitbuf; int bitcnt; jmp_buf env; }; static int puff_bits(struct puff_state* s, int need) { long val = s->bitbuf; while (s->bitcnt < need) { if (s->incnt == s->inlen) longjmp(s->env, 1); val |= (long)(s->in[s->incnt++]) << s->bitcnt; s->bitcnt += 8; } s->bitbuf = (int)(val >> need); s->bitcnt -= need; return (int)(val & ((1L << need) - 1)); } static int puff_stored(struct puff_state* s) { s->bitbuf = 0; s->bitcnt = 0; if (s->incnt + 4 > s->inlen) return 2; unsigned len = s->in[s->incnt++]; len |= s->in[s->incnt++] << 8; if (s->in[s->incnt++] != (~len & 0xff) || s->in[s->incnt++] != ((~len >> 8) & 0xff)) return -2; if (s->incnt + len > s->inlen) return 2; if (s->outcnt + len > s->outlen) return 1; for (; len--; s->outcnt++, s->incnt++) { if (s->in[s->incnt]) s->out[s->outcnt] = s->in[s->incnt]; } return 0; } struct puff_huffman { short* count; short* symbol; }; static int puff_decode(struct puff_state* s, const struct puff_huffman* h) { int first = 0; int index = 0; int bitbuf = s->bitbuf; int left = s->bitcnt; int code = first = index = 0; int len = 1; short* next = h->count + 1; while (1) { while (left--) { code |= bitbuf & 1; bitbuf >>= 1; int count = *next++; if (code - count < first) { s->bitbuf = bitbuf; s->bitcnt = (s->bitcnt - len) & 7; return h->symbol[index + (code - first)]; } index += count; first += count; first <<= 1; code <<= 1; len++; } left = (MAXBITS + 1) - len; if (left == 0) break; if (s->incnt == s->inlen) longjmp(s->env, 1); bitbuf = s->in[s->incnt++]; if (left > 8) left = 8; } return -10; } static int puff_construct(struct puff_huffman* h, const short* length, int n) { int len; for (len = 0; len <= MAXBITS; len++) h->count[len] = 0; int symbol; for (symbol = 0; symbol < n; symbol++) (h->count[length[symbol]])++; if (h->count[0] == n) return 0; int left = 1; for (len = 1; len <= MAXBITS; len++) { left <<= 1; left -= h->count[len]; if (left < 0) return left; } short offs[MAXBITS + 1]; offs[1] = 0; for (len = 1; len < MAXBITS; len++) offs[len + 1] = offs[len] + h->count[len]; for (symbol = 0; symbol < n; symbol++) if (length[symbol] != 0) h->symbol[offs[length[symbol]]++] = symbol; return left; } static int puff_codes(struct puff_state* s, const struct puff_huffman* lencode, const struct puff_huffman* distcode) { static const short lens[29] = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258}; static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0}; static const short dists[30] = { 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; static const short dext[30] = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; int symbol; do { symbol = puff_decode(s, lencode); if (symbol < 0) return symbol; if (symbol < 256) { if (s->outcnt == s->outlen) return 1; if (symbol) s->out[s->outcnt] = symbol; s->outcnt++; } else if (symbol > 256) { symbol -= 257; if (symbol >= 29) return -10; int len = lens[symbol] + puff_bits(s, lext[symbol]); symbol = puff_decode(s, distcode); if (symbol < 0) return symbol; unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]); if (dist > s->outcnt) return -11; if (s->outcnt + len > s->outlen) return 1; while (len--) { if (dist <= s->outcnt && s->out[s->outcnt - dist]) s->out[s->outcnt] = s->out[s->outcnt - dist]; s->outcnt++; } } } while (symbol != 256); return 0; } static int puff_fixed(struct puff_state* s) { static int virgin = 1; static short lencnt[MAXBITS + 1], lensym[FIXLCODES]; static short distcnt[MAXBITS + 1], distsym[MAXDCODES]; static struct puff_huffman lencode, distcode; if (virgin) { lencode.count = lencnt; lencode.symbol = lensym; distcode.count = distcnt; distcode.symbol = distsym; short lengths[FIXLCODES]; int symbol; for (symbol = 0; symbol < 144; symbol++) lengths[symbol] = 8; for (; symbol < 256; symbol++) lengths[symbol] = 9; for (; symbol < 280; symbol++) lengths[symbol] = 7; for (; symbol < FIXLCODES; symbol++) lengths[symbol] = 8; puff_construct(&lencode, lengths, FIXLCODES); for (symbol = 0; symbol < MAXDCODES; symbol++) lengths[symbol] = 5; puff_construct(&distcode, lengths, MAXDCODES); virgin = 0; } return puff_codes(s, &lencode, &distcode); } static int puff_dynamic(struct puff_state* s) { static const short order[19] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; int nlen = puff_bits(s, 5) + 257; int ndist = puff_bits(s, 5) + 1; int ncode = puff_bits(s, 4) + 4; if (nlen > MAXLCODES || ndist > MAXDCODES) return -3; short lengths[MAXCODES]; int index; for (index = 0; index < ncode; index++) lengths[order[index]] = puff_bits(s, 3); for (; index < 19; index++) lengths[order[index]] = 0; short lencnt[MAXBITS + 1], lensym[MAXLCODES]; struct puff_huffman lencode = {lencnt, lensym}; int err = puff_construct(&lencode, lengths, 19); if (err != 0) return -4; index = 0; while (index < nlen + ndist) { int symbol; int len; symbol = puff_decode(s, &lencode); if (symbol < 0) return symbol; if (symbol < 16) lengths[index++] = symbol; else { len = 0; if (symbol == 16) { if (index == 0) return -5; len = lengths[index - 1]; symbol = 3 + puff_bits(s, 2); } else if (symbol == 17) symbol = 3 + puff_bits(s, 3); else symbol = 11 + puff_bits(s, 7); if (index + symbol > nlen + ndist) return -6; while (symbol--) lengths[index++] = len; } } if (lengths[256] == 0) return -9; err = puff_construct(&lencode, lengths, nlen); if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1])) return -7; short distcnt[MAXBITS + 1], distsym[MAXDCODES]; struct puff_huffman distcode = {distcnt, distsym}; err = puff_construct(&distcode, lengths + nlen, ndist); if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1])) return -8; return puff_codes(s, &lencode, &distcode); } static int puff(unsigned char* dest, unsigned long* destlen, const unsigned char* source, unsigned long sourcelen) { struct puff_state s = { .out = dest, .outlen = *destlen, .outcnt = 0, .in = source, .inlen = sourcelen, .incnt = 0, .bitbuf = 0, .bitcnt = 0, }; int err; if (setjmp(s.env) != 0) err = 2; else { int last; do { last = puff_bits(&s, 1); int type = puff_bits(&s, 2); err = type == 0 ? puff_stored(&s) : (type == 1 ? puff_fixed(&s) : (type == 2 ? puff_dynamic(&s) : -1)); if (err != 0) break; } while (!last); } *destlen = s.outcnt; return err; } //% END CODE DERIVED FROM puff.{c,h} #define ZLIB_HEADER_WIDTH 2 static int puff_zlib_to_file(const unsigned char* source, unsigned long sourcelen, int dest_fd) { if (sourcelen < ZLIB_HEADER_WIDTH) return 0; source += ZLIB_HEADER_WIDTH; sourcelen -= ZLIB_HEADER_WIDTH; const unsigned long max_destlen = 132 << 20; void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0); if (ret == MAP_FAILED) return -1; unsigned char* dest = (unsigned char*)ret; unsigned long destlen = max_destlen; int err = puff(dest, &destlen, source, sourcelen); if (err) { munmap(dest, max_destlen); errno = -err; return -1; } if (write(dest_fd, dest, destlen) != (ssize_t)destlen) { munmap(dest, max_destlen); return -1; } return munmap(dest, max_destlen); } static int setup_loop_device(unsigned char* data, unsigned long size, const char* loopname, int* loopfd_p) { int err = 0, loopfd = -1; int memfd = syscall(__NR_memfd_create, "syzkaller", 0); if (memfd == -1) { err = errno; goto error; } if (puff_zlib_to_file(data, size, memfd)) { err = errno; goto error_close_memfd; } loopfd = open(loopname, O_RDWR); if (loopfd == -1) { err = errno; goto error_close_memfd; } if (ioctl(loopfd, LOOP_SET_FD, memfd)) { if (errno != EBUSY) { err = errno; goto error_close_loop; } ioctl(loopfd, LOOP_CLR_FD, 0); usleep(1000); if (ioctl(loopfd, LOOP_SET_FD, memfd)) { err = errno; goto error_close_loop; } } close(memfd); *loopfd_p = loopfd; return 0; error_close_loop: close(loopfd); error_close_memfd: close(memfd); error: errno = err; return -1; } static void reset_loop_device(const char* loopname) { int loopfd = open(loopname, O_RDWR); if (loopfd == -1) { return; } if (ioctl(loopfd, LOOP_CLR_FD, 0)) { } close(loopfd); } static long syz_mount_image(volatile long fsarg, volatile long dir, volatile long flags, volatile long optsarg, volatile long change_dir, volatile unsigned long size, volatile long image) { unsigned char* data = (unsigned char*)image; int res = -1, err = 0, need_loop_device = !!size; char* mount_opts = (char*)optsarg; char* target = (char*)dir; char* fs = (char*)fsarg; char* source = NULL; char loopname[64]; if (need_loop_device) { int loopfd; memset(loopname, 0, sizeof(loopname)); snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); if (setup_loop_device(data, size, loopname, &loopfd) == -1) return -1; close(loopfd); source = loopname; } mkdir(target, 0777); char opts[256]; memset(opts, 0, sizeof(opts)); if (strlen(mount_opts) > (sizeof(opts) - 32)) { } strncpy(opts, mount_opts, sizeof(opts) - 32); if (strcmp(fs, "iso9660") == 0) { flags |= MS_RDONLY; } else if (strncmp(fs, "ext", 3) == 0) { bool has_remount_ro = false; char* remount_ro_start = strstr(opts, "errors=remount-ro"); if (remount_ro_start != NULL) { char after = *(remount_ro_start + strlen("errors=remount-ro")); char before = remount_ro_start == opts ? '\0' : *(remount_ro_start - 1); has_remount_ro = ((before == '\0' || before == ',') && (after == '\0' || after == ',')); } if (strstr(opts, "errors=panic") || !has_remount_ro) strcat(opts, ",errors=continue"); } else if (strcmp(fs, "xfs") == 0) { strcat(opts, ",nouuid"); } else if (strncmp(fs, "gfs2", 4) == 0 && (strstr(opts, "errors=panic") || strstr(opts, "debug"))) { strcat(opts, ",errors=withdraw"); } res = mount(source, target, fs, flags, opts); if (res == -1) { err = errno; goto error_clear_loop; } res = open(target, O_RDONLY | O_DIRECTORY); if (res == -1) { err = errno; goto error_clear_loop; } if (change_dir) { res = chdir(target); if (res == -1) { err = errno; } } error_clear_loop: if (need_loop_device) reset_loop_device(loopname); errno = err; return res; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void reset_loop() { char buf[64]; snprintf(buf, sizeof(buf), "/dev/loop%llu", procid); int loopfd = open(buf, O_RDWR); if (loopfd != -1) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } struct thread_t { int created, call; event_t ready, done; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { event_wait(&th->ready); event_reset(&th->ready); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); event_set(&th->done); } return 0; } static void execute_one(void) { if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } int i, call, thread; for (call = 0; call < 6; call++) { for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; event_init(&th->ready); event_init(&th->done); event_set(&th->done); thread_start(thr, th); } if (!event_isset(&th->done)) continue; event_reset(&th->done); th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); event_set(&th->ready); if (call == 0) break; event_timedwait(&th->done, 50 + (call == 0 ? 4000 : 0)); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { reset_loop(); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[1] = {0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: // syz_mount_image$ext4 arguments: [ // fs: ptr[in, buffer] { // buffer: {65 78 74 34 00} (length 0x5) // } // dir: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 32 00} (length 0x8) // } // flags: mount_flags = 0x88 (8 bytes) // opts: ptr[in, fs_options[ext4_options]] { // fs_options[ext4_options] { // elems: array[fs_opt_elem[ext4_options]] { // fs_opt_elem[ext4_options] { // elem: union ext4_options { // nogrpid: buffer: {6e 6f 67 72 70 69 64} (length 0x7) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // min_batch_time: fs_opt["min_batch_time", fmt[hex, int32]] { // name: buffer: {6d 69 6e 5f 62 61 74 63 68 5f 74 69 6d 65} // (length 0xe) eq: const = 0x3d (1 bytes) val: int32 = 0x1 // (18 bytes) // } // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // debug_want_extra_isize: fs_opt["debug_want_extra_isize", // fmt[hex, int32]] { // name: buffer: {64 65 62 75 67 5f 77 61 6e 74 5f 65 78 74 // 72 61 5f 69 73 69 7a 65} (length 0x16) eq: const = 0x3d (1 // bytes) val: int32 = 0x68 (18 bytes) // } // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // nobarrier: buffer: {6e 6f 62 61 72 72 69 65 72} (length 0x9) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // nodiscard: buffer: {6e 6f 64 69 73 63 61 72 64} (length 0x9) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // quota: buffer: {71 75 6f 74 61} (length 0x5) // } // comma: const = 0x2c (1 bytes) // } // } // common: array[fs_opt_elem[fs_options_common]] { // } // null: const = 0x0 (1 bytes) // } // } // chdir: int8 = 0x3 (1 bytes) // size: len = 0x42f (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x42f) // } // ] // returns fd_dir NONFAILING(memcpy((void*)0x200000000540, "ext4\000", 5)); NONFAILING(memcpy((void*)0x2000000001c0, "./file2\000", 8)); NONFAILING(memcpy((void*)0x2000000005c0, "nogrpid", 7)); NONFAILING(*(uint8_t*)0x2000000005c7 = 0x2c); NONFAILING(memcpy((void*)0x2000000005c8, "min_batch_time", 14)); NONFAILING(*(uint8_t*)0x2000000005d6 = 0x3d); NONFAILING(sprintf((char*)0x2000000005d7, "0x%016llx", (long long)1)); NONFAILING(*(uint8_t*)0x2000000005e9 = 0x2c); NONFAILING(memcpy((void*)0x2000000005ea, "debug_want_extra_isize", 22)); NONFAILING(*(uint8_t*)0x200000000600 = 0x3d); NONFAILING(sprintf((char*)0x200000000601, "0x%016llx", (long long)0x68)); NONFAILING(*(uint8_t*)0x200000000613 = 0x2c); NONFAILING(memcpy((void*)0x200000000614, "nobarrier", 9)); NONFAILING(*(uint8_t*)0x20000000061d = 0x2c); NONFAILING(memcpy((void*)0x20000000061e, "nodiscard", 9)); NONFAILING(*(uint8_t*)0x200000000627 = 0x2c); NONFAILING(memcpy((void*)0x200000000628, "quota", 5)); NONFAILING(*(uint8_t*)0x20000000062d = 0x2c); NONFAILING(*(uint8_t*)0x20000000062e = 0); NONFAILING(memcpy( (void*)0x200000000d80, "\x78\x9c\xec\xdb\xcf\x6b\x1c\x55\x1c\x00\xf0\xef\xcc\x26\xad\xfd\x65" "\x62\xa9\x3f\x9a\x56\x8d\x56\x31\xf8\x23\x69\xd2\x5a\x7b\xf0\xa2\x28" "\x78\x50\x10\xf4\x50\x8f\x31\x49\x4b\xec\xb6\x91\x26\x82\x2d\x41\xa3" "\x48\x3d\x4a\xc1\xbb\x78\x14\xfc\x0b\x3c\xe9\x45\xd4\x93\xe0\x55\xef" "\x52\x28\x92\x4b\xab\xa7\x95\xd9\x9d\x49\x76\x37\xbb\x69\x92\x6e\xb2" "\xd5\xfd\x7c\x60\x92\xf7\x66\xde\xf2\xde\x77\x67\xde\xee\x7b\xf3\x76" "\x02\xe8\x59\xc3\xd9\x9f\x24\x62\x7f\x44\xfc\x1e\x11\x03\xb5\x6c\x63" "\x81\xe1\xda\xbf\x5b\xcb\x8b\x53\x7f\x2f\x2f\x4e\x25\x51\xa9\xbc\xf5" "\x57\x52\x2d\x77\x73\x79\x71\xaa\x28\x5a\xbc\x6e\x5f\x91\xe9\x8b\x48" "\x3f\x4b\xe2\x48\x8b\x7a\xe7\x2f\x5f\x39\x3f\x59\x2e\xcf\x5c\xca\xf3" "\x63\x0b\x17\xde\x1f\x9b\xbf\x7c\xe5\xb9\xd9\x0b\x93\xe7\x66\xce\xcd" "\x5c\x9c\x38\x7d\xfa\xe4\x89\xf1\x17\x4e\x4d\x3c\xdf\x91\x38\xb3\xb8" "\x6e\x0e\x7d\x34\x77\xf4\xf0\x6b\xef\x5c\x7b\x63\xea\xcc\xb5\x77\x7f" "\xfe\x36\x29\xe2\x6f\x8a\xa3\x43\x86\xd7\x3b\xf8\x64\xa5\xd2\xe1\xea" "\xba\xeb\x40\x5d\x3a\xe9\xeb\x62\x43\xd8\x94\x52\xad\x9b\x46\x7f\xb5" "\xff\x0f\x44\x29\x56\x4f\xde\x40\xbc\xfa\x69\x57\x1b\x07\x6c\xab\x4a" "\xa5\x52\x79\xa0\xfd\xe1\xa5\x0a\xf0\x3f\x96\x44\xb7\x5b\x00\x74\x47" "\xf1\x45\x9f\xcd\x7f\x8b\x6d\x87\x86\x1e\x77\x85\x1b\x2f\xd5\x26\x40" "\x59\xdc\xb7\xf2\xad\x76\xa4\x2f\xd2\xbc\x4c\x7f\xd3\xfc\xb6\x93\x86" "\x23\xe2\xcc\xd2\x3f\x5f\x65\x5b\x6c\xcf\x7d\x08\x00\x80\x06\xdf\x67" "\xe3\x9f\x67\x5b\x8d\xff\xd2\xa8\xbf\x2f\x74\x6f\xbe\x86\x32\x18\x11" "\xf7\x45\xc4\xc1\x88\x38\x15\x11\x87\x22\xe2\xfe\x88\x6a\xd9\x07\x23" "\xe2\xa1\x4d\xd6\xdf\xbc\x48\xb2\x76\xfc\x93\x5e\xdf\x52\x60\x1b\x94" "\x8d\xff\x5e\xcc\xd7\xb6\x1a\xc7\x7f\xc5\xe8\x2f\x06\x4b\x79\xee\x40" "\x35\xfe\xfe\xe4\xec\x6c\x79\xe6\x78\xfe\x9e\x8c\x44\xff\xee\x2c\x3f" "\xbe\x4e\x1d\x3f\xbc\xf2\xdb\x17\xed\x8e\xd5\x8f\xff\xb2\x2d\xab\xbf" "\x18\x0b\xe6\xed\xb8\xde\xb7\xbb\xf1\x35\xd3\x93\x0b\x93\x77\x12\x73" "\xbd\x1b\x9f\x44\x0c\xf5\xb5\x8a\x3f\x59\x59\x09\x48\x22\xe2\x70\x44" "\x0c\x6d\xb1\x8e\xd9\xa7\xbf\x39\xda\xee\xd8\xed\xe3\x5f\x47\x07\xd6" "\x99\x2a\x5f\x47\x3c\x55\x3b\xff\x4b\xd1\x14\x7f\x21\x59\x7f\x7d\x72" "\xec\x9e\x28\xcf\x1c\x1f\x2b\xae\x8a\xb5\x7e\xf9\xf5\xea\x9b\xed\xea" "\xbf\xa3\xf8\x3b\x20\x3b\xff\x7b\x5b\x5e\xff\x2b\xf1\x0f\x26\xf5\xeb" "\xb5\xf3\x9b\xaf\xe3\xea\x1f\x9f\xb7\x9d\xd3\x6c\xf5\xfa\xdf\x95\xbc" "\xdd\xb0\xef\xc3\xc9\x85\x85\x4b\xe3\x11\xbb\x92\xd7\x6b\x8d\xae\xdf" "\x3f\xd1\x54\x6e\x62\xb5\x7c\x16\xff\xc8\xb1\xd6\xfd\xff\x60\xac\xbe" "\x13\x47\x22\x22\xbb\x88\x1f\x8e\x88\x47\x22\xe2\xd1\xbc\xed\x8f\x45" "\xc4\xe3\x11\x71\x6c\x9d\xf8\x7f\x7a\xf9\x89\xf7\xb6\x1e\xff\xf6\xca" "\xe2\x9f\xde\xd4\xf9\x5f\x4d\xec\x8a\xe6\x3d\xad\x13\xa5\xf3\x3f\x7e" "\xd7\x50\xe9\xe0\x66\xe2\xcf\xce\xff\xc9\x6a\x6a\x24\xdf\xb3\x91\xcf" "\xbf\x8d\xb4\x6b\x6b\x57\x33\x00\x00\x00\xfc\xf7\xa4\x11\xb1\x3f\x92" "\x74\x74\x25\x9d\xa6\xa3\xa3\xb5\xdf\xf0\x1f\x8a\xbd\x69\x79\x6e\x7e" "\xe1\x99\xb3\x73\x1f\x5c\x9c\xae\x3d\x23\x30\x18\xfd\x69\x71\xa7\x6b" "\xa0\xee\x7e\xe8\x78\x3e\xad\x2f\xf2\x13\x4d\xf9\x13\xf9\x7d\xe3\x2f" "\x4b\x7b\xaa\xf9\xd1\xa9\xb9\xf2\x74\xb7\x83\x87\x1e\xb7\xaf\x4d\xff" "\xcf\xfc\x59\xea\x76\xeb\x80\x6d\xe7\x79\x2d\xe8\x5d\xfa\x3f\xf4\x2e" "\xfd\x1f\x7a\x97\xfe\x0f\xbd\xab\x45\xff\xdf\xd3\x8d\x76\x00\x3b\xaf" "\xd5\xf7\xff\xc7\x5d\x68\x07\xb0\xf3\x9a\xfa\xbf\x65\x3f\xe8\x21\xe6" "\xff\xd0\xbb\xf4\x7f\xe8\x5d\xfa\x3f\xf4\xa4\xf9\x3d\x71\xfb\x87\xe4" "\x25\x24\xd6\x24\x22\xbd\x2b\x9a\x21\xb1\x4d\x89\x6e\x7f\x32\x01\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x74\xc6\xbf\x01\x00\x00\xff\xff\x50\x38\xe6\xd5", 1071)); NONFAILING(syz_mount_image(/*fs=*/0x200000000540, /*dir=*/0x2000000001c0, /*flags=MS_NOEXEC|MS_DIRSYNC*/ 0x88, /*opts=*/0x2000000005c0, /*chdir=*/3, /*size=*/0x42f, /*img=*/0x200000000d80)); break; case 1: // creat arguments: [ // file: ptr[in, buffer] { // buffer: {2e 2f 62 75 73 00} (length 0x6) // } // mode: open_mode = 0x88 (8 bytes) // ] // returns fd NONFAILING(memcpy((void*)0x200000000200, "./bus\000", 6)); syscall(__NR_creat, /*file=*/0x200000000200ul, /*mode=S_IXGRP|S_IWUSR*/ 0x88ul); break; case 2: // mount arguments: [ // src: ptr[in, blockdev_filename] { // union blockdev_filename { // loop: loop_filename { // prefix: buffer: {2f 64 65 76 2f 6c 6f 6f 70} (length 0x9) // id: proc = 0x0 (1 bytes) // z: const = 0x0 (1 bytes) // } // } // } // dst: ptr[in, buffer] { // buffer: {2e 2f 62 75 73 00} (length 0x6) // } // type: nil // flags: mount_flags = 0x63d014 (8 bytes) // data: nil // ] NONFAILING(memcpy((void*)0x200000000380, "/dev/loop", 9)); NONFAILING(*(uint8_t*)0x200000000389 = 0x30); NONFAILING(*(uint8_t*)0x20000000038a = 0); NONFAILING(memcpy((void*)0x200000000180, "./bus\000", 6)); syscall( __NR_mount, /*src=*/0x200000000380ul, /*dst=*/0x200000000180ul, /*type=*/0ul, /*flags=MS_UNBINDABLE|MS_POSIXACL|MS_REC|MS_SYNCHRONOUS|MS_SILENT|0x601004*/ 0x63d014ul, /*data=*/0ul); break; case 3: // open arguments: [ // file: ptr[in, buffer] { // buffer: {2e 2f 62 75 73 00} (length 0x6) // } // flags: open_flags = 0x185102 (8 bytes) // mode: open_mode = 0x0 (8 bytes) // ] // returns fd NONFAILING(memcpy((void*)0x200000000080, "./bus\000", 6)); res = syscall(__NR_open, /*file=*/0x200000000080ul, /*flags=O_SYNC|O_NOCTTY|O_DIRECT|O_CLOEXEC|O_RDWR*/ 0x185102ul, /*mode=*/0ul); if (res != -1) r[0] = res; break; case 4: // mmap arguments: [ // addr: VMA[0x800000] // len: len = 0x800000 (8 bytes) // prot: mmap_prot = 0x2 (8 bytes) // flags: mmap_flags = 0x28011 (8 bytes) // fd: fd (resource) // offset: intptr = 0x0 (8 bytes) // ] syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x800000ul, /*prot=PROT_WRITE*/ 2ul, /*flags=MAP_STACK|MAP_POPULATE|MAP_FIXED|MAP_SHARED*/ 0x28011ul, /*fd=*/r[0], /*offset=*/0ul); break; case 5: // ioctl$KVM_SET_USER_MEMORY_REGION arguments: [ // fd: fd_kvmvm (resource) // cmd: const = 0x4020ae46 (4 bytes) // arg: ptr[in, kvm_userspace_memory_region] { // kvm_userspace_memory_region { // slot: kvm_mem_slots = 0x0 (4 bytes) // flags: kvm_mem_region_flags = 0x0 (4 bytes) // paddr: kvm_guest_addrs = 0x0 (8 bytes) // size: len = 0x20002000 (8 bytes) // addr: VMA[0x2000] // } // } // ] NONFAILING(*(uint32_t*)0x200000000400 = 0); NONFAILING(*(uint32_t*)0x200000000404 = 0); NONFAILING(*(uint64_t*)0x200000000408 = 0); NONFAILING(*(uint64_t*)0x200000000410 = 0x20002000); NONFAILING(*(uint64_t*)0x200000000418 = 0x200000000000); syscall(__NR_ioctl, /*fd=*/(intptr_t)-1, /*cmd=*/0x4020ae46, /*arg=*/0x200000000400ul); break; } } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; install_segv_handler(); loop(); return 0; }